/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile$

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

#ifndef vtkMaterialInterfaceUtilities_h
#define vtkMaterialInterfaceUtilities_h

// Vtk
#include "vtkCommunicator.h" // for vtkCommunicator
// Vtk containers
#include "vtkDoubleArray.h"      // for vtkDoubleArray
#include "vtkFloatArray.h"       // for vtkFloatArray
#include "vtkIntArray.h"         // for vtkIntArray
#include "vtkUnsignedIntArray.h" // for vtkUnsignedIntArray
// STL
#include <fstream> // for file operations
using std::ifstream;
using std::ofstream;
#include <sstream> // for std::ostringstream
using std::ostringstream;
#include <vector> // for std::vector
using std::vector;
#include <string> // for std::string
using std::string;
// other
#include <cassert> // for assert

// some useful functionality that stradles multiple filters
// and has file scope.
namespace
{
// vector memory management helper
template <class T>
void ClearVectorOfPointers(vector<T*>& V)
{
  size_t n = V.size();
  for (size_t i = 0; i < n; ++i)
  {
    if (V[i] != 0)
    {
      delete V[i];
    }
  }
  V.clear();
}
// vector memory management helper
template <class T>
void ClearVectorOfVtkPointers(vector<T*>& V)
{
  size_t n = V.size();
  for (size_t i = 0; i < n; ++i)
  {
    if (V[i] != nullptr)
    {
      V[i]->Delete();
    }
  }
  V.clear();
}
// vector memory management helper
template <class T>
void ClearVectorOfArrayPointers(vector<T*>& V)
{
  size_t n = V.size();
  for (size_t i = 0; i < n; ++i)
  {
    if (V[i] != 0)
    {
      delete[] V[i];
    }
  }
  V.clear();
}
// vector memory management helper
template <class T>
void ResizeVectorOfVtkPointers(vector<T*>& V, int n)
{
  ClearVectorOfVtkPointers(V);

  V.resize(n);
  for (int i = 0; i < n; ++i)
  {
    V[i] = T::New();
  }
}
// vector memory management helper
template <class T>
void ResizeVectorOfArrayPointers(vector<T*>& V, int nV, int nA)
{
  ClearVectorOfArrayPointers(V);

  V.resize(nV);
  for (int i = 0; i < nV; ++i)
  {
    V[i] = new T[nA];
  }
}
// vector memory management helper
template <class T>
void ResizeVectorOfVtkArrayPointers(vector<T*>& V, int nComps, vtkIdType nTups, string name, int nv)
{
  ClearVectorOfVtkPointers(V);

  V.resize(nv);
  for (int i = 0; i < nv; ++i)
  {
    V[i] = T::New();
    V[i]->SetNumberOfComponents(nComps);
    V[i]->SetNumberOfTuples(nTups);
    V[i]->SetName(name.c_str());
  }
}
// vector memory management helper
template <class T>
void ResizeVectorOfVtkArrayPointers(vector<T*>& V, int nComps, int nv)
{
  ResizeVectorOfVtkArrayPointers(V, nComps, 0, "", nv);
}
// vector memory management helper
template <class T>
void ResizeVectorOfVtkArrayPointers(vector<T*>& V, int nComps, int nTups, int nv)
{
  ResizeVectorOfVtkArrayPointers(V, nComps, nTups, "", nv);
}

// vtk object memory management helper
template <class T>
inline void ReNewVtkPointer(T*& pv)
{
  if (pv != nullptr)
  {
    pv->Delete();
  }
  pv = T::New();
}
// vtk object memory management helper
template <class T>
inline void NewVtkArrayPointer(T*& pv, int nComps, vtkIdType nTups, std::string name)
{
  pv = T::New();
  pv->SetNumberOfComponents(nComps);
  pv->SetNumberOfTuples(nTups);
  pv->SetName(name.c_str());
}
// vtk object memory management helper
template <class T>
inline void ReNewVtkArrayPointer(T*& pv, int nComps, vtkIdType nTups, std::string name)
{
  if (pv != nullptr)
  {
    pv->Delete();
  }
  NewVtkArrayPointer(pv, nComps, nTups, name);
}
// vtk object memory management helper
template <class T>
inline void ReNewVtkArrayPointer(T*& pv, std::string name)
{
  ReNewVtkArrayPointer(pv, 1, 0, name);
}
// vtk object memory management helper
template <class T>
inline void ReleaseVtkPointer(T*& pv)
{
  assert("Attempted to release a 0 pointer." && pv != 0);
  pv->Delete();
  pv = nullptr;
}
// vtk object memory management helper
template <class T>
inline void CheckAndReleaseVtkPointer(T*& pv)
{
  if (pv == nullptr)
  {
    return;
  }
  pv->Delete();
  pv = nullptr;
}
// memory management helper
template <class T>
inline void CheckAndReleaseArrayPointer(T*& pv)
{
  if (pv == nullptr)
  {
    return;
  }
  delete[] pv;
  pv = nullptr;
}
// memory management helper
template <class T>
inline void CheckAndReleaseCArrayPointer(T*& pv)
{
  if (pv == 0)
  {
    return;
  }
  free(pv);
  pv = 0;
}
// zero vector
template <class T>
inline void FillVector(vector<T>& V, const T& v)
{
  size_t n = V.size();
  for (size_t i = 0; i < n; ++i)
  {
    V[i] = v;
  }
}
// Copier to copy from an array where type is not known
// into a destination buffer.
// returns 0 if the type of the source array
// is not supported.
template <class T>
inline int CopyTuple(T* dest, // scalar/vector
  vtkDataArray* src,          //
  int nComps,                 //
  int srcCellIndex)           //
{
  // convert cell index to array index
  int srcIndex = nComps * srcCellIndex;
  // copy
  switch (src->GetDataType())
  {
    case VTK_FLOAT:
    {
      float* thisTuple = dynamic_cast<vtkFloatArray*>(src)->GetPointer(srcIndex);
      for (int q = 0; q < nComps; ++q)
      {
        dest[q] = static_cast<T>(thisTuple[q]);
      }
    }
    break;
    case VTK_DOUBLE:
    {
      double* thisTuple = dynamic_cast<vtkDoubleArray*>(src)->GetPointer(srcIndex);
      for (int q = 0; q < nComps; ++q)
      {
        dest[q] = static_cast<T>(thisTuple[q]);
      }
    }
    break;
    case VTK_INT:
    {
      int* thisTuple = dynamic_cast<vtkIntArray*>(src)->GetPointer(srcIndex);
      for (int q = 0; q < nComps; ++q)
      {
        dest[q] = static_cast<T>(thisTuple[q]);
      }
    }
    break;
    case VTK_UNSIGNED_INT:
    {
      unsigned int* thisTuple = dynamic_cast<vtkUnsignedIntArray*>(src)->GetPointer(srcIndex);
      for (int q = 0; q < nComps; ++q)
      {
        dest[q] = static_cast<T>(thisTuple[q]);
      }
    }
    break;
    default:
      assert("This data type is unsupported." && 0);
      return 0;
      break;
  }
  return 1;
}

#ifdef vtkMaterialInterfaceFilterDEBUG
//
int WritePidFile(vtkCommunicator* comm, string pidFileName)
{
  // build an identifier string
  // "host : rank : pid"
  int nProcs = comm->GetNumberOfProcesses();
  int myProcId = comm->GetLocalProcessId();
  const int hostNameSize = 256;
  char hostname[hostNameSize] = { '\0' };
  gethostname(hostname, hostNameSize);
  int pid = getpid();
  const int hrpSize = 512;
  char hrp[hrpSize] = { '\0' };
  sprintf(hrp, "%s : %d : %d", hostname, myProcId, pid);
  // move all identifiers to controller
  char* hrpBuffer = 0;
  if (myProcId == 0)
  {
    hrpBuffer = new char[nProcs * hrpSize];
  }
  comm->Gather(hrp, hrpBuffer, hrpSize, 0);
  // put identifiers into a file
  if (myProcId == 0)
  {
    // open a file in the current working directory
    ofstream hrpFile;
    hrpFile.open(pidFileName.c_str());
    char* thisHrp = hrpBuffer;
    if (hrpFile.is_open())
    {
      for (int procId = 0; procId < nProcs; ++procId)
      {
        hrpFile << thisHrp << endl;
        thisHrp += hrpSize;
      };
      hrpFile.close();
    }
    // if we can't open a file send to stderr
    else
    {
      for (int procId = 0; procId < nProcs; ++procId)
      {
        cerr << thisHrp << endl;
        thisHrp += hrpSize;
      }
    }
    delete[] hrpBuffer;
  }

  return pid;
}
//
string GetMemoryUsage(int pid, int line, int procId)
{
  ostringstream memoryUsage;

  ostringstream statusFileName;
  statusFileName << "/proc/" << pid << "/status";
  ifstream statusFile;
  statusFile.open(statusFileName.str().c_str());
  if (statusFile.is_open())
  {
    const int cbufSize = 1024;
    char cbuf[cbufSize] = { '\0' };
    while (statusFile.good())
    {
      statusFile.getline(cbuf, cbufSize);
      string content(cbuf);
      if (content.find("VmSize") != string::npos || content.find("VmRSS") != string::npos ||
        content.find("VmData") != string::npos)
      {
        int tabStart = content.find_first_of("\t ");
        int tabSpan = 1;
        while (content[tabStart + tabSpan] == '\t' || content[tabStart + tabSpan] == ' ')
        {
          ++tabSpan;
        }
        string formattedContent =
          content.substr(0, tabStart - 1) + " " + content.substr(tabStart + tabSpan);
        memoryUsage << "[" << line << "] " << procId << " " << formattedContent << endl;
      }
    }
    statusFile.close();
  }
  else
  {
    cerr << "[" << line << "] " << procId << " could not open " << statusFileName << "." << endl;
  }

  return memoryUsage.str();
}

template <class T>
void writeTuple(ostream& sout, T* tup, int nComp)
{
  if (nComp == 1)
  {
    sout << tup[0];
  }
  else
  {
    sout << "(" << tup[0];
    for (int q = 1; q < nComp; ++q)
    {
      sout << ", " << tup[q];
    }
    sout << ")";
  }
}
//
ostream& operator<<(ostream& sout, vtkDoubleArray& da)
{
  sout << "Name:          " << da.GetName() << endl;

  int nTup = da.GetNumberOfTuples();
  int nComp = da.GetNumberOfComponents();

  sout << "NumberOfComps: " << nComp << endl;
  sout << "NumberOfTuples:" << nTup << endl;
  if (nTup == 0)
  {
    sout << "{}" << endl;
  }
  else
  {
    sout << "{";
    double* thisTup = da.GetTuple(0);
    writeTuple(sout, thisTup, nComp);
    for (int i = 1; i < nTup; ++i)
    {
      thisTup = da.GetTuple(i);
      sout << ", ";
      writeTuple(sout, thisTup, nComp);
    }
    sout << "}" << endl;
  }
  return sout;
}
//
ostream& operator<<(ostream& sout, vector<vtkDoubleArray*>& vda)
{
  size_t nda = vda.size();
  for (size_t i = 0; i < nda; ++i)
  {
    sout << "[" << i << "]\n" << *vda[i] << endl;
  }
  return sout;
}
//
ostream& operator<<(ostream& sout, vector<vector<int>>& vvi)
{
  size_t nv = vvi.size();
  for (size_t i = 0; i < nv; ++i)
  {
    sout << "[" << i << "]{";
    size_t ni = vvi[i].size();
    if (ni < 1)
    {
      sout << "}" << endl;
      continue;
    }
    sout << vvi[i][0];
    for (size_t j = 1; j < ni; ++j)
    {
      sout << "," << vvi[i][j];
    }
    sout << "}" << endl;
  }
  return sout;
}
//
ostream& operator<<(ostream& sout, vector<int>& vi)
{
  sout << "{";
  size_t ni = vi.size();
  if (ni < 1)
  {
    sout << "}";
    return sout;
  }
  sout << vi[0];
  for (size_t j = 1; j < ni; ++j)
  {
    sout << "," << vi[j];
  }
  sout << "}";

  return sout;
}
// //
// ostream &operator<<(ostream &sout, vtkDoubleArray &da)
// {
//   sout << "Name:          " << da.GetName() << endl;
//
//   vtkIdType nTup = da.GetNumberOfTuples();
//   int nComp = da.GetNumberOfComponents();
//
//   sout << "NumberOfComps: " << nComp << endl;
//   sout << "NumberOfTuples:" << nTup << endl;
//   sout << "{\n";
//   for (int i=0; i<nTup; ++i)
//     {
//     double *thisTup=da.GetTuple(i);
//     for (int q=0; q<nComp; ++q)
//       {
//       sout << thisTup[q] << ",";
//       }
//       sout << (char)0x08 << "\n";
//     }
//   sout << "}\n";
//
//   return sout;
// }
// write a set of loading arrays
// ostream &operator<<(ostream &sout,
//   vector<vector<vtkIdType> > &pla)
// {
//   int nProcs=pla.size();
//   for (int procId=0; procId<nProcs; ++procId)
//     {
//     cerr << "Fragment loading on process " << procId << ":" << endl;
//     int nLocalFragments=pla[procId].size();
//     for (int fragmentIdx=0; fragmentIdx<nLocalFragments; ++fragmentIdx)
//       {
//       if (pla[procId][fragmentIdx]>0)
//         {
//         sout << "("
//             << fragmentIdx
//             << ","
//             << pla[procId][fragmentIdx]
//             << "), ";
//         }
//       }
//     sout << endl;
//     }
//   return sout;
// }
#endif
//
template <typename TCnt, typename TLabel>
void PrintHistogram(vector<TCnt>& bins, vector<TLabel>& binIds)
{
  const int maxWidth = 40;
  const size_t n = bins.size();
  if (n == 0)
  {
    return;
  }
  int maxBin = *max_element(bins.begin(), bins.end());
  for (size_t i = 0; i < n; ++i)
  {
    if (bins[i] == 0)
    {
      continue;
    }
    // clip at width of 40.
    int wid = maxBin < maxWidth ? bins[i] : bins[i] * maxWidth / maxBin;
    cerr << "{" << setw(12) << std::left << binIds[i] << "}*";
    for (int j = 1; j < wid; ++j)
    {
      cerr << "*";
    }
    cerr << "(" << bins[i] << ")" << endl;
  }
}
//
template <typename TCnt>
void PrintHistogram(vector<TCnt>& bins)
{
  // generate default labels, 0...n
  const int n = static_cast<int>(bins.size());
  vector<int> binIds(n);
  for (int i = 0; i < n; ++i)
  {
    binIds[i] = i;
  }
  //
  PrintHistogram(bins, binIds);
}
};
#endif
